Description:

BACKGROUND OF THE INVENTION

[0001]1. Field of the Invention

[0002]The present invention relates to golf club head fabrication
technology and more particularly, to a metal alloy, which is formed of a
number of materials suitable for making rustproof golf club heads
economically in an environment friendly manner without electroplating.

[0005]Further, the aforesaid various conventional materials are not
specifically developed for golf club head. Because a golf club head has a
specially designed configuration, the material used must have high
toughness and high extensibility characteristics. Using low carbon steel
to make a golf club head requires an electroplating process that is not
environment-friendly. A golf club head made in this way does not achieve
expected ball control effect.

[0006]Therefore, it is desirable to provide a metal alloy for golf club
head that eliminates the aforesaid problems.

SUMMARY OF THE INVENTION

[0007]The present invention has been accomplished under the circumstances
in view. It is one object of the present invention to provide a metal
alloy, which is practical for making a rustproof golf club head
economically in an environment friendly manner without electroplating to
facilitate ball control.

[0013]Further, the metal alloy is adapted for making golf club heads for
iron head, sand wedge and putter.

[0014]In general, the metal alloy for gold club head consists of carbon,
silicon, manganese, chrome, nickel, cerium, phosphor, sulfur, and at
least 95% formed of a ferrite structure containing austenitic and
pearite. The metal alloy is practical for making a rustproof golf club
head economically in an environment friendly manner without
electroplating. Therefore, the invention has an industrial value.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

[0015]A metal alloy for golf club head in accordance with the present
invention is prepared from carbon, silicon, manganese, chrome, nickel,
cerium, phosphor, sulfur and iron.

[0016]Carbon (C) is a requisite nonmetal element for making the metal
alloy. The content of carbon in the metal alloy is 0.08% max. preferably
0.08% for carbide precipitation and ferrite structure formation.

[0017]Silicon (Si) is a heat-resisting nonmetal element having a magnetic
characteristic. The content of silicon in the metal alloy is 1.5% max.,
preferably 1.5% for the advantage of prohibiting formation of gas pores
and enhancing contraction and flowability of casting fluid.

[0018]Manganese (Mn) is a metal element for removing oxide from alloy. The
content of manganese in the metal alloy is 1.5% max., preferably 1.5% for
the advantage of effectively eliminating the harmful effect of hot
brittleness on the metal alloy caused by sulfur.

[0019]Chrome (Cr) is a metal element having wear resistant and corrosion
resistant characteristics. The content of chrome in the metal alloy is
16%˜28%. for the advantage of rustproof effect.

[0020]Nickel (Ni) is a metal element having enhanced tough and low
temperature impact resistant characteristics. The content of nickel in
the metal alloy is 1% max. for the advantage of improving the
extensibility of the metal alloy.

[0022]Phosphor (P) is a nonmetal element having grain-coarsening, hardness
enhancing and tensile strength enhancing. The content of phosphor in the
metal alloy is 0.03% max. for the advantage of maintaining extensibility
and toughness.

[0023]Sulfur (S) is a requisite nonmetal element of the metal alloy. The
content of sulfur in the metal alloy is 0.02% max, preferably 0.02%.

[0024]Except carbon, silicon, manganese, chrome, nickel, cerium, phosphor
and sulfur that are prepared subject to a predetermined ratio, iron is
used as the base material for composing the metal alloy having excellent
strength, high extensibility and rustproof characteristics. Because the
metal alloy has at least 95% formed of a ferrite structure and a small
ratio formed of austenite and fine pearite, a golf club head made of this
metal alloy shows excellent ball control performance, much better than a
golf club head made of a conventional mild steel.

[0025]Further, a golf club head can be made of a metal alloy prepared from
carbon, silicon, manganese, chrome, nickel, cerium, phosphor, sulfur and
iron directly by means of dewax casting or forging.

[0028]A metal alloy made according to the aforesaid composition has high
strength, high extensibility, rust-prevention and excellent ball control
characteristics, suitable for making iron head, sand wedge, putter.

[0029]In conclusion, the metal alloy for golf club head consists of
carbon, silicon, manganese, chrome, nickel, cerium, phosphor, sulfur, and
iron. The metal alloy is practical for making a rustproof golf club head
economically in an environment friendly manner without electroplating.
Therefore, the invention has an industrial value. Further, at least 95%
of the metal alloy is formed of a ferrite structure containing austenitic
and pearite, providing excellent ball control effect. Further, molybdenum
(Mo) may be added to the metal alloy to enhance the rigidity. Further,
titanium, zirconium, or boron may be added to the metal alloy to obtain
fine grain size of the ferrite structure, providing better structural
strength, better extensibility, and better rustproof and ball control
performance. Therefore, the invention provides an industrial value.

[0030]Although particular embodiments of the invention have been described
in detail for purposes of illustration, various modifications and
enhancements may be made without departing from the spirit and scope of
the invention. Accordingly, the invention is not to be limited except as
by the appended claims.